Engine



E. HILTN.

' ENGINE.

APPLICATION min MAmH, 1920.

Patented May 10,1921.

Ams. I

m w H W .n

- UNITED STATES EINAR HILTON, OF VANCOUVER, BRITISHYCOLUMBIA, CANADA.

PATENT orifice.

ENGINE.

dent of the city of Vancouver, in the Province of BritishA Columbia,.Canada, have invented certain new and useful Improvements in` Engines, of which the following 1s a i specilication.

My invention relates to improvements in engines, with more particular reference to those ofthe internal `combustion type, and the object of my invention is to devise an engine which is comparatively simple in constructlon, 1nr which the parts are lso arranged v to enable n va very compact machine to be provided `capable of developing the maximum horse power and which is evenly balanced so as to reduce vibration and undue Wear-to a minimum;

I attain this object by the construction illustrated in the accompanying drawings in which- Figure 1 is a sectional elevation of the engine cylinder and valve mechanism.

Fig.2 is a sectional view of the cylinder, the pistons being shown in full.

Fig. 3 is a view of the connecting rod arrangement. v

Similar figures of reference indicate similar parts throughout the several views.

1 indicates the engine cylinder, which, it will be noted, is much longer than the usual type, and which is closed at its opposite ends the cover 2 and front head 3 respectively.

b Vigithin the cylinder and secured to it equidistant from each other are cylindrical heads 4, 5, and 6 which divide the main cylinder 1, as it were, into shorter cylinders 7, 8, 9 and 10, in which cylinders are mounted for reciprocation pistons 11, 12, 13, and 14, these pistons being provided with the usual piston rings 15, as shown. The heads 3, 4, 5, and 6 are reduced in diameter, as indicated by the numerals 16 and 17, the reductions 16 being for the purpose of providing admission space for the gas charges and reductions 17 being made to lit freely the bore of the respective pistons. The pisy tons 11, 12 and 13, are made double ended and piston 14, single ended, pistons 11 and,

12 being mounted on a hollow piston rod 18 which extends slidably through the front head 3 and head 4 into head 5, while pistons 13 and 14 are mounted on apiston rod 19 which extends slidably through the bore of Specification of Letters Patent. Patented May 10, 1921 i Application led March 11, 1920. Serial No. 364,932.

the piston rod 18 and the heads 5 and 6, as shown, these rods being provided with suitable packing rings, indicated by the numeral 20 to prevent leakage of gas past them. These piston rods 18 and 19 are connected to suitable connecting rods 21 and 22 which are in turn connected to the crank shaft and in order to provide clearance between the ends of the piston rods during operationA of the engine connecting rod 22 is madelonger than connecting rod 21, Ywhile clearance between the connecting rods themselves is proy vided for by forming the piston rod 18 with an offset end 23.1which carries` the wrist pin 24.

25 indicates the inlet, and 26 the exhaust, valvesrof the. engine, there ,being an, inlet and an exhaust valve at the opposite` ends of each cylinder 7 8, 9, and 10 from which it lwill be seen that gas charges may be admltted into, and exhausted from, the opposite ends of the cylinders, thusrendering them double-acting.

These valves, inlet and exhaust, are of the usual puppet type, the necessary valve seats being provided in the cylinder walls, as shown, and they are actuated at the proper moments by means of cam shafts 27 and 28 .driven by any suitable means, such `as, for instance, being gear connected to the crank shaft, the valve lifting cams 29 and 30 engaging' the ends of tappets 31 and 32 which contact with the ends of the valve stems 33 and 34 in the well-known manner, springs 35 and 36 beingl provided for the reseating of the valves. T e tappets 31 and 32 are fitted with pistons or plungers 37 and 38 operating in suitably mounted cylinders 39 and 40 whereby they are guided and steadied in their stroke.

41 indicates the main fuel supply pipe having branches 42 and 43 serving the inlet passages 44, 45, 46, and 47 serving the respective cylinders, while 48 indicates the main exhaust pipe with which the respective exhaust valves communicate through branches 49. 50 indicates the carbureter and 51 spark plugs for the opposite ends of each cylinder. The heads 3, 4, 5 and 6 are made hollow, as shown, to allow for their cooling by the circulation of water therethrough, while the cylinder walls are waterjacketed in any well approved manner and here it may be mentioned that the main cylinder 1 need not necessarily be -cast in one piece, b ut may be formed in two or more parts rigidly bolted together when assembled. Y

y The manner in which the engine operates may be briefly described. On referring to the drawings and particularly Fig. l itwill be observed `that pistons ll and l2 are at `the end of their in-stroke and pistonsl and 14 are at the end of vtheir out-stroke, the cranks then being positioned accordingly, asr shown in F ig. 3. Prior to arriving at the ends of these respective in and out strokes a charge 'of gas Was admitted in Vfront of, the respective pistons and coinpressed thereby so that on iiring the Vcompressed chargesthe pistons llwl?, and 13- 14 will be driven forwardly and backwardly l respectively to compressother charges adrespective cylinders. rIt will thusl bessenv that there'are four pistons operating onthe crankshaft but only one main cylinder, 'somitted at'the opposite ends of the cylinder whicliwhen tired will againdrive pistons 11-12 and lB-llifbackwardly and forwardly respectively and simultaneously,v sol Vthat continued rotation of the cranksY is thereby eected as long as gas chargesfare admitted to, compressed, and fired in, the

Y that-such an engines extremely compact outer'cylinder heads closing the ends of said cylinder, inner cylinder heads spaced apart from one another and from said outer heads to dene a. plurality of smaller cylinders Within said main cylinder, said inner cylin- .der heads being circumferentially"'reduced on opposite sides thereof toV form stepped projections, cylinders slidable between-said heads and pocketed to receive the smaller of said projections, the rlarger of said stepped projections of eachV head: being arranged to define a compression space in conjunction kwith the surrounding wall of themain cylinder, a sleeve like piston; rod extending through certain of saidheadsand connected to certain of ,said pistons,aiseclond piston 'rod extending throughA saidv first-mentioned rod and through the remaining inner heads f. and connected tothe remaining pistons. Signed at Vancouver, B. C., Canada.`,"th1s 28th dayof February, 1920. 1 f

' EINAR HILTON. 

